Backport release/v6.6: Disable mempool traffic in freeze mode

[seidroid]

Backport of #3990 to release/v6.6.

[seidroid]

Please cherry-pick the changes locally and resolve any conflicts.

git fetch origin backport-3990-to-release/v6.6
git worktree add --checkout .worktree/backport-3990-to-release/v6.6 backport-3990-to-release/v6.6
cd .worktree/backport-3990-to-release/v6.6
git reset --hard HEAD^
git cherry-pick -x 50e1129ebfc92487f59067d13daca22c26bcb4b1
git push --force-with-lease

[github-actions]

The latest Buf updates on your PR. Results from workflow Buf / buf (pull_request).

Build	Format	Lint	Breaking	Updated (UTC)
✅ passed	✅ passed	✅ passed	✅ passed	Aug 25, 2026, 1:45 PM

[codecov]

Codecov Report

❌ Patch coverage is 91.07143% with 5 lines in your changes missing coverage. Please review.
✅ Project coverage is 58.18%. Comparing base (869b849) to head (3b3351e).

Files with missing lines	Patch %	Lines
sei-tendermint/node/node.go	77.77%	1 Missing and 1 partial ⚠️
sei-tendermint/node/public.go	81.81%	1 Missing and 1 partial ⚠️
sei-tendermint/internal/rpc/core/env.go	75.00%	1 Missing ⚠️

Additional details and impacted files

@@               Coverage Diff                @@
##           release/v6.6    #4006      +/-   ##
================================================
- Coverage         59.04%   58.18%   -0.86%     
================================================
  Files              2228     2154      -74     
  Lines            183783   175283    -8500     
================================================
- Hits             108509   101991    -6518     
+ Misses            65507    64221    -1286     
+ Partials           9767     9071     -696     

Flag	Coverage Δ
sei-chain-pr	51.33% <91.07%> (?)
sei-db	69.80% <ø> (ø)
sei-db-state-db	?

Flags with carried forward coverage won't be shown. Click here to find out more.

Files with missing lines	Coverage Δ
sei-cosmos/server/config/config.go	94.84% <ø> (+0.30%)	⬆️
sei-cosmos/server/config/toml.go	57.14% <ø> (ø)
sei-cosmos/server/start.go	25.18% <100.00%> (+0.57%)	⬆️
sei-tendermint/internal/rpc/core/evidence.go	84.61% <100.00%> (+2.79%)	⬆️
sei-tendermint/internal/rpc/core/mempool.go	44.80% <100.00%> (+1.87%)	⬆️
sei-tendermint/node/setup.go	70.30% <100.00%> (+0.27%)	⬆️
sei-tendermint/internal/rpc/core/env.go	78.28% <75.00%> (-0.08%)	⬇️
sei-tendermint/node/node.go	65.28% <77.77%> (+1.05%)	⬆️
sei-tendermint/node/public.go	72.88% <81.81%> (+8.77%)	⬆️

... and 74 files with indirect coverage changes

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[cursor]

PR Summary

Medium Risk
Changes node networking and RPC write behavior for operators using freeze-height; misconfiguration could surprise clients expecting broadcast to work while queries succeed.

Overview
When freeze-height is set on a full node, the node now runs in a stricter read-only freeze mode: query RPC stays up, but transaction and evidence broadcasts are rejected with ErrReadOnly, the mempool P2P reactor is not started, and the mempool channel is omitted from advertised node info. Mempool read paths (e.g. unconfirmed txs) remain available for queries.

validateFreezeMode is centralized at node startup so freeze height is allowed only for full nodes (validator and seed modes error). Config/CLI help in sei-cosmos is updated to describe freeze mode (including that tx/evidence submission and mempool gossip are disabled from startup). Integration tests in freeze_test.go cover mode validation and RPC/mempool behavior.

^{Reviewed by Cursor Bugbot for commit 3b3351e. Bugbot is set up for automated code reviews on this repo. Configure here.}

[masih]

I approve of this 🎩 (PR, not the hat)